Bandwidth Diversity Reception - Yaesu FTDX9000MP Operation Manual

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Bandwidth Diversity Reception

This mode involves receiving the same signal through two different bandpass filters. The frequency and mode of both the
Main band (VFO-A) and Sub band (VFO-B) band are the same. The Main band (VFO-A) can be set up for a narrow
bandpass, and the Sub band (VFO-B) for a wide bandpass, using the [ WIDTH ] knobs, resulting in a spatial perception of
the channel. Although any mode (except FM) can be used, CW offers the widest array of choices, and perhaps the most
startling effects on crowded channels.
Stereo headphones or an external stereo speaker are recommended for this mode. To set up the transceiver for bandwidth
diversity reception:
Select the desired mode on the Main band (VFO-A).
Tune to the signal of interest.
Press the [ A M ] button to copy this mode and fre-
quency into the Sub band (VFO-B).
If using headphones, set the headphone mixing scheme
to the "MID" mode via the Menu Selection: "RX AU-
DIO 083 HEADPHONE MIX" and activate dual re-
ception.
Adjust the [ AF GAIN ] knob(s) to balance the volume
of the two receivers.
Now try manipulating the [ SHIFT ] and [ WIDTH ] con-
trols (on both Main band (VFO-A) and Sub band
(VFO-B) receivers) to observe the interesting effects
of bandwidth diversity.
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SUB(VFO-B)
[AF GAIN] Knob
D O
UPLEX PERATION
Switch MAIN(VFO-A)
[AF GAIN] Knob
Polarity Diversity
Similar in concept to the bandwidth diversity ca-
pability just described, another interesting capabil-
ity of the FT 9000MP is the ability to use two
DX
different antennas on the same frequency, using dual
reception. for example, you might have a horizon-
tal Yagi on the main band, and a vertical antenna
on the sub band, then lock the two frequencies to-
gether and engage dual reception.
Frequently, the fading observed on the HF bands is
not so much a change in ionization level, but rather
a shift in the polarization of the signal as it travels
to and from the ionosphere. Having an opposite-
polarization antenna available can fill in the signal
during deep fades, and you may then transmit on
whichever antenna is providing the strongest sig-
nal at the moment (see the discussion below on Split
Frequency operation).
FT 9000MP O
DX
VDD BIAS TEMP SWR
M
PERATION ANUAL